Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15edf97473fe61ec5f5e6ba086679fd56b974a234658f7df4df10b2e8924ee2b' 
  AND token = 'fHDia8cB/cSJWfmCtW3Lxxxb+OKA+1ryLRHMp9i6WHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}